A) 331.89 kg
B) 277.78 kg
C) 279.78 kg
D) 278.5 kg
E) None of these
Correct Answer: A
Solution :
Explanation Option [a] is correct. Volume of iron = \[\pi h\left( {{R}^{2}}-{{r}^{2}} \right)=\pi \times 132\,\left( {{21}^{2}}-{{19}^{2}} \right)=33188.57\,c{{m}^{3}}.\] Therefore, weight of the roller \[=33158.5710=331.89\text{ }kg.\]
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